Bug 8733: Add IDreamBooks.com enhanced content

Bug 8733: Add IDreamBooks.com enhanced content

Adds the following enhanced content to the OPAC, all controlled by
separate sysprefs:
1) A "Readometer" which summarizes reviews on the OPAC detail page
2) A tab with snippets of critical reviews on the OPAC detail page
3) A computed rating on the results page

To test:
Find a book that is listed on IDreamBooks.com (you may have to make
sure that you have the first edition), and one that is not. Try
each of IDreamBooksReadometer, IDreamBooksReviews, and
IDreamBooksResults sysprefs, taking note of the content appearing (or
not) as appropriate.

Updated to add missing CSS to new theme.

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
all tests pass.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Rebased to latest master 2012-12-31

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>